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🔨 Rebound Hammer Test for Concrete Strength
JGJ/T 23: drop extremes → mean → strength curve conversion → estimated strength
Rebound readings per test zone (one zone per line, ≥10 values)
Test logic (JGJ/T 23)
· In each zone, drop the 3 largest and 3 smallest rebound readings; average the remaining 10 to get mean rebound Rm, then correct for angle/casting surface to get R = Rm + ΔR.
· Converted strength fcu,i = a·Rb (strength curve). Use your local certified/calibrated curve coefficients a, b (editable sample values here).
· Estimated strength: ≥10 zones → mean − 1.645·std; <10 zones → minimum zone strength.
· Carbonation depth affects conversion; for the official report, evaluate comprehensively using JGJ/T 23 tables.
About Rebound Hammer Concrete Strength
Rebound hammer concrete strength calculator: apply angle, casting surface and carbonation depth corrections per JGJ/T 23 and convert rebound values to strength.
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